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1、摘要倒车雷达是汽车泊车或者倒车时的安全辅助装置。该系统能够在汽车低速倒车的过程中，识别出车体后部的障碍物，并能够测量汽车与障碍物之间的距离。在车辆与障碍物发生碰撞之前，发出语音警报，提醒司机刹车。针对汽车行业中倒车雷达现状，本文提出了一种以ARM9处理器ARM920T和Linux操作系统为软硬件平台的数据采集方案、超声波发射接收装置、语音报警模块等多模块设计，完成了对倒车系统复杂情况的判断、测距、语音报警等功能。从测试的准确行，可观性、稳定性上对可视倒车雷达系统的组成取得了新的突破。本系统采用超声波换能器产生超声波
2、，当超声波碰到障碍物后因阻挡而被反射，系统通过CSB40R接收，然后通过超声波的发射和接收之间的时间差而测出距离；通过语音报警系统通知司机具体的距离及危险程度。该系统的有效运用可使我们更好的避免交通事故，有效的利用高端科技为日常生活服务。关键词：嵌入式系统;超声波;ARM9;Linux操作系统;语音报警IAbstractWiththedevelopmentofthetechnologyoftheelectronic,auto,embedandinformationinrecentyears,theembedsyst
3、emhasbeenwidelyappliedineachfield.Thankstotheprogressofthecomputer,communicationandautomation,especiallytheimprovementoftheembedtechnology,selectingaembedoperatingsystemwillbeaveryeffectivethingthatwillimprovethecapabilityandtheempolderrate,whichwillsupplyasup
4、portplatformforthemodernizationandinformatizationoftheindustry.Inconnectionwiththecurrentsituationofreversingradar,thepaperputsforwardadesignofmoduleswhichisbasedonARM9processornamedARM920TandtheLinuxcontrolsystem,whichhasallthefunctionsincluding:ultrasonicsen
5、d/inceptmodule,alarmmoduleofsoundetc.Thesystemcallcompletethefunctionsofjudgement,measuredistance,audioalertandsoon.Thereversingradarbreaksthroughintermsofveracity,observability,stability.Inordertoproducetheultrasoundthesystemadoptsthedeviceofultrasonictransdu
6、cerwhichhasthefeatureofechoingwhentheultrasonictouchingthebarrier.ThereflectedwavewillbetakenoverbyCSB40R,thenARMcantestthetimefromsendingtoreceiving,fromwhichthecontrollercallmeasurethedistancefrombarriertocar.Accordingtothejudgementthecontrollercanalsoalarmt
7、hedriverofthedistancefromthebarriertothecarwiththedangerouscircumstances.Ifthecontrollersystemisusedeffectively,itcanbetterserveourdalylife,forexampleitcarlreducethetrafficaccidentsdrastically.Thepracticabilityandtheactualizationareemphasizedintheresearchcours
8、e.Withrespecttohardwares,wechoosethecommonones.Andwealsohavedonemuchworkinimprovingandverifyingthegordiantechnique.Thepracticalresultsshowthatthereversingradarsystemwithaccuracytes
